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77185 Cherryh, provisional designation 2001 FE9, is a background asteroid from the central regions of the asteroid belt, approximately 4 kilometers (2.5 miles) in diameter. It was discovered on 20 March 2001, by American amateur astronomers Don Wells and Alex Cruz at the George Observatory in Needville, Texas. The dark asteroid was named for American writer C. J. Cherryh.[1]

77185 Cherryh
Orbital diagram of Cherryh
Discovery[1]
Discovered byD. Wells
A. Cruz
Discovery siteGeorge Obs.
Discovery date20 March 2001
Designations
MPC designation
(77185) Cherryh
Named after
C. J. Cherryh[1]
(American writer)
Alternative designations
2001 FE9 · 1998 TG27
Minor planet category
main-belt[1][2] · (middle)
background[3][4]
Orbital characteristics[2]
Epoch 27 April 2019 (JD 2458600.5)
Uncertainty parameter 0
Observation arc27.71 yr (10,121 d)
Aphelion3.0501 AU
Perihelion2.1431 AU
Semi-major axis
2.5966 AU
Eccentricity0.1746
Orbital period (sidereal)
4.18 yr (1,528 d)
Mean anomaly
70.105°
Mean motion
0° 14m 8.16s / day
Inclination3.1456°
Longitude of ascending node
12.636°
Argument of perihelion
231.33°
Physical characteristics
Mean diameter
3.985±0.166 km[5]
Geometric albedo
0.049±0.009[5]
Absolute magnitude (H)
15.9[1][2]

    Orbit and classification


    Cherryh is a non-family asteroid from the main belt's background population.[3][4] It orbits the Sun in the central asteroid belt at a distance of 2.1–3.1 AU once every 4 years and 2 months (1,528 days; semi-major axis of 2.6 AU). Its orbit has an eccentricity of 0.17 and an inclination of 3° with respect to the ecliptic.[2] The body's observation arc begins in October 1990, with a precovery taken by Spacewatch, more than 10 years prior to its official discovery observation at Needville.[1]


    Naming


    This minor planet was named by the discovering members of the Fort Bend Astronomy Club (FBAC), after C. J. Cherryh (born 1942), the award-winning American science fiction and fantasy author.[1] The official naming citation was published by the Minor Planet Center on 13 July 2004 (M.P.C. 52327).[6]


    Physical characteristics


    According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Cherryh measures 3.985 kilometers in diameter and its surface has an albedo of 0.049.[5] The asteroid's spectral type is unknown. Based on its low geometric albedo it is likely a carbonaceous C-type asteroid. As of 2018, no rotational lightcurve of Cherryh has been obtained from photometric observations. The body's rotation period, pole and shape remain unknown.[2][7]


    References


    1. "77185 Cherryh (2001 FE9)". Minor Planet Center. Retrieved 5 December 2018.
    2. "JPL Small-Body Database Browser: 77185 Cherryh (2001 FE9)" (2018-07-10 last obs.). Jet Propulsion Laboratory. Retrieved 5 December 2018.
    3. "Asteroid 77185 Cherryh". Small Bodies Data Ferret. Retrieved 5 December 2018.
    4. "Asteroid (77185) Cherryh – Proper elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 4 December 2018.
    5. Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J.; et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal. 741 (2): 20. arXiv:1109.4096. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. S2CID 118745497.
    6. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 5 December 2018.
    7. "LCDB Data for (77185) Cherryh". Asteroid Lightcurve Database (LCDB). Retrieved 5 December 2018.



    На других языках


    [de] (77185) Cherryh

    (77185) Cherryh ist ein im mittleren Hauptgürtel gelegener Asteroid. Er wurde am 20. März 2001 von den US-amerikanischen Amateurastronomen Don J. Wells und Alex Cruz am George-Observatorium (IAU-Code 735) entdeckt. Das George-Observatorium gehört zum Houston Museum of Natural Science und befindet sich im Brazos Bend State Park des Houstoner Vorortes Needville. Sichtungen des Asteroiden hatte es vorher schon am 15. und 20. Oktober 1998 an der auf dem Kitt Peak gelegenen Außenstation des Steward Observatory gegeben.[1]
    - [en] 77185 Cherryh



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